50 Ohm verses 75 Ohm Coaxial Connectors


Xmultiple's Engineering Department

So what¡¦s the difference between 50 and 75 Ohm Coaxial Connectors?

The difference can be found in the center pins and dialectric insulators. 75-ohm coaxial connectors feature Teflon as a dialectric, and surround the outer spring fingers with air. Its center pin maintains a consistent diameter in both the front and rear areas. 50-ohm connectors, on the other hand, use Delrin to surround the spring fingers, and its center pin is larger in the crimp area. It is important to note that you will need a different crimp tool for each type of center pin during installation.

50 Ohm and 75 Ohm have major differences in functionality. Both connectors can mate with the coaxial cable however you cannot mix and match 50 and 75 ohm. You will not have the same video quality with 50 ohm which you have with 75 ohm. Therefore, if you installed a traditional 50-ohm connector on a 75-ohm coaxial video cable, the digital signal would be significantly distorted.

The 50-ohm coaxial connectors are used for older analog video applications. But for higher performance A/V applications like HDTVs you must use 75-ohm devices. 75-ohm coaxial connectors can, however, be used for analog applications.

To know if you have 75 ohm connectors and cable the center pin must have the same diameter in the crimp area as the mating area in order to have true 75-ohm impedance. If a connector claims to be 75-ohm but doesn¡¦t have a consistent pin length, it¡¦s an inferior product which is not of the highest quality.


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